The Harrowing, League of Legends' Halloween-themed event, is back and it's underway, with a new mode, character skins, and this video (above) explaining how it all fits in to the game's lore.
The return of The Harrowing adds the "Hexakill" mode, which involves two teams of six, played on a smaller map, Twisted Treeline, with one big-ass spider on it, regulating. The Harrowing also brings two new skins for characters LeBlanc and Wukong, in addition to a dozen old ones.
League of Legends is, of course, free-to-play, so getting these skins cost money. The full list, with prices, is here.